xref: /openbmc/linux/drivers/hwmon/lm63.c (revision 63dc02bd)
1 /*
2  * lm63.c - driver for the National Semiconductor LM63 temperature sensor
3  *          with integrated fan control
4  * Copyright (C) 2004-2008  Jean Delvare <khali@linux-fr.org>
5  * Based on the lm90 driver.
6  *
7  * The LM63 is a sensor chip made by National Semiconductor. It measures
8  * two temperatures (its own and one external one) and the speed of one
9  * fan, those speed it can additionally control. Complete datasheet can be
10  * obtained from National's website at:
11  *   http://www.national.com/pf/LM/LM63.html
12  *
13  * The LM63 is basically an LM86 with fan speed monitoring and control
14  * capabilities added. It misses some of the LM86 features though:
15  *  - No low limit for local temperature.
16  *  - No critical limit for local temperature.
17  *  - Critical limit for remote temperature can be changed only once. We
18  *    will consider that the critical limit is read-only.
19  *
20  * The datasheet isn't very clear about what the tachometer reading is.
21  * I had a explanation from National Semiconductor though. The two lower
22  * bits of the read value have to be masked out. The value is still 16 bit
23  * in width.
24  *
25  * This program is free software; you can redistribute it and/or modify
26  * it under the terms of the GNU General Public License as published by
27  * the Free Software Foundation; either version 2 of the License, or
28  * (at your option) any later version.
29  *
30  * This program is distributed in the hope that it will be useful,
31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
33  * GNU General Public License for more details.
34  *
35  * You should have received a copy of the GNU General Public License
36  * along with this program; if not, write to the Free Software
37  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
38  */
39 
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/jiffies.h>
44 #include <linux/i2c.h>
45 #include <linux/hwmon-sysfs.h>
46 #include <linux/hwmon.h>
47 #include <linux/err.h>
48 #include <linux/mutex.h>
49 #include <linux/sysfs.h>
50 #include <linux/types.h>
51 
52 /*
53  * Addresses to scan
54  * Address is fully defined internally and cannot be changed except for
55  * LM64 which has one pin dedicated to address selection.
56  * LM63 and LM96163 have address 0x4c.
57  * LM64 can have address 0x18 or 0x4e.
58  */
59 
60 static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
61 
62 /*
63  * The LM63 registers
64  */
65 
66 #define LM63_REG_CONFIG1		0x03
67 #define LM63_REG_CONVRATE		0x04
68 #define LM63_REG_CONFIG2		0xBF
69 #define LM63_REG_CONFIG_FAN		0x4A
70 
71 #define LM63_REG_TACH_COUNT_MSB		0x47
72 #define LM63_REG_TACH_COUNT_LSB		0x46
73 #define LM63_REG_TACH_LIMIT_MSB		0x49
74 #define LM63_REG_TACH_LIMIT_LSB		0x48
75 
76 #define LM63_REG_PWM_VALUE		0x4C
77 #define LM63_REG_PWM_FREQ		0x4D
78 #define LM63_REG_LUT_TEMP_HYST		0x4F
79 #define LM63_REG_LUT_TEMP(nr)		(0x50 + 2 * (nr))
80 #define LM63_REG_LUT_PWM(nr)		(0x51 + 2 * (nr))
81 
82 #define LM63_REG_LOCAL_TEMP		0x00
83 #define LM63_REG_LOCAL_HIGH		0x05
84 
85 #define LM63_REG_REMOTE_TEMP_MSB	0x01
86 #define LM63_REG_REMOTE_TEMP_LSB	0x10
87 #define LM63_REG_REMOTE_OFFSET_MSB	0x11
88 #define LM63_REG_REMOTE_OFFSET_LSB	0x12
89 #define LM63_REG_REMOTE_HIGH_MSB	0x07
90 #define LM63_REG_REMOTE_HIGH_LSB	0x13
91 #define LM63_REG_REMOTE_LOW_MSB		0x08
92 #define LM63_REG_REMOTE_LOW_LSB		0x14
93 #define LM63_REG_REMOTE_TCRIT		0x19
94 #define LM63_REG_REMOTE_TCRIT_HYST	0x21
95 
96 #define LM63_REG_ALERT_STATUS		0x02
97 #define LM63_REG_ALERT_MASK		0x16
98 
99 #define LM63_REG_MAN_ID			0xFE
100 #define LM63_REG_CHIP_ID		0xFF
101 
102 #define LM96163_REG_TRUTHERM		0x30
103 #define LM96163_REG_REMOTE_TEMP_U_MSB	0x31
104 #define LM96163_REG_REMOTE_TEMP_U_LSB	0x32
105 #define LM96163_REG_CONFIG_ENHANCED	0x45
106 
107 #define LM63_MAX_CONVRATE		9
108 
109 #define LM63_MAX_CONVRATE_HZ		32
110 #define LM96163_MAX_CONVRATE_HZ		26
111 
112 /*
113  * Conversions and various macros
114  * For tachometer counts, the LM63 uses 16-bit values.
115  * For local temperature and high limit, remote critical limit and hysteresis
116  * value, it uses signed 8-bit values with LSB = 1 degree Celsius.
117  * For remote temperature, low and high limits, it uses signed 11-bit values
118  * with LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
119  * For LM64 the actual remote diode temperature is 16 degree Celsius higher
120  * than the register reading. Remote temperature setpoints have to be
121  * adapted accordingly.
122  */
123 
124 #define FAN_FROM_REG(reg)	((reg) == 0xFFFC || (reg) == 0 ? 0 : \
125 				 5400000 / (reg))
126 #define FAN_TO_REG(val)		((val) <= 82 ? 0xFFFC : \
127 				 (5400000 / (val)) & 0xFFFC)
128 #define TEMP8_FROM_REG(reg)	((reg) * 1000)
129 #define TEMP8_TO_REG(val)	((val) <= -128000 ? -128 : \
130 				 (val) >= 127000 ? 127 : \
131 				 (val) < 0 ? ((val) - 500) / 1000 : \
132 				 ((val) + 500) / 1000)
133 #define TEMP8U_TO_REG(val)	((val) <= 0 ? 0 : \
134 				 (val) >= 255000 ? 255 : \
135 				 ((val) + 500) / 1000)
136 #define TEMP11_FROM_REG(reg)	((reg) / 32 * 125)
137 #define TEMP11_TO_REG(val)	((val) <= -128000 ? 0x8000 : \
138 				 (val) >= 127875 ? 0x7FE0 : \
139 				 (val) < 0 ? ((val) - 62) / 125 * 32 : \
140 				 ((val) + 62) / 125 * 32)
141 #define TEMP11U_TO_REG(val)	((val) <= 0 ? 0 : \
142 				 (val) >= 255875 ? 0xFFE0 : \
143 				 ((val) + 62) / 125 * 32)
144 #define HYST_TO_REG(val)	((val) <= 0 ? 0 : \
145 				 (val) >= 127000 ? 127 : \
146 				 ((val) + 500) / 1000)
147 
148 #define UPDATE_INTERVAL(max, rate) \
149 			((1000 << (LM63_MAX_CONVRATE - (rate))) / (max))
150 
151 enum chips { lm63, lm64, lm96163 };
152 
153 /*
154  * Client data (each client gets its own)
155  */
156 
157 struct lm63_data {
158 	struct device *hwmon_dev;
159 	struct mutex update_lock;
160 	char valid; /* zero until following fields are valid */
161 	char lut_valid; /* zero until lut fields are valid */
162 	unsigned long last_updated; /* in jiffies */
163 	unsigned long lut_last_updated; /* in jiffies */
164 	enum chips kind;
165 	int temp2_offset;
166 
167 	int update_interval;	/* in milliseconds */
168 	int max_convrate_hz;
169 	int lut_size;		/* 8 or 12 */
170 
171 	/* registers values */
172 	u8 config, config_fan;
173 	u16 fan[2];	/* 0: input
174 			   1: low limit */
175 	u8 pwm1_freq;
176 	u8 pwm1[13];	/* 0: current output
177 			   1-12: lookup table */
178 	s8 temp8[15];	/* 0: local input
179 			   1: local high limit
180 			   2: remote critical limit
181 			   3-14: lookup table */
182 	s16 temp11[4];	/* 0: remote input
183 			   1: remote low limit
184 			   2: remote high limit
185 			   3: remote offset */
186 	u16 temp11u;	/* remote input (unsigned) */
187 	u8 temp2_crit_hyst;
188 	u8 lut_temp_hyst;
189 	u8 alarms;
190 	bool pwm_highres;
191 	bool lut_temp_highres;
192 	bool remote_unsigned; /* true if unsigned remote upper limits */
193 	bool trutherm;
194 };
195 
196 static inline int temp8_from_reg(struct lm63_data *data, int nr)
197 {
198 	if (data->remote_unsigned)
199 		return TEMP8_FROM_REG((u8)data->temp8[nr]);
200 	return TEMP8_FROM_REG(data->temp8[nr]);
201 }
202 
203 static inline int lut_temp_from_reg(struct lm63_data *data, int nr)
204 {
205 	return data->temp8[nr] * (data->lut_temp_highres ? 500 : 1000);
206 }
207 
208 static inline int lut_temp_to_reg(struct lm63_data *data, long val)
209 {
210 	val -= data->temp2_offset;
211 	if (data->lut_temp_highres)
212 		return DIV_ROUND_CLOSEST(SENSORS_LIMIT(val, 0, 127500), 500);
213 	else
214 		return DIV_ROUND_CLOSEST(SENSORS_LIMIT(val, 0, 127000), 1000);
215 }
216 
217 /*
218  * Update the lookup table register cache.
219  * client->update_lock must be held when calling this function.
220  */
221 static void lm63_update_lut(struct i2c_client *client)
222 {
223 	struct lm63_data *data = i2c_get_clientdata(client);
224 	int i;
225 
226 	if (time_after(jiffies, data->lut_last_updated + 5 * HZ) ||
227 	    !data->lut_valid) {
228 		for (i = 0; i < data->lut_size; i++) {
229 			data->pwm1[1 + i] = i2c_smbus_read_byte_data(client,
230 					    LM63_REG_LUT_PWM(i));
231 			data->temp8[3 + i] = i2c_smbus_read_byte_data(client,
232 					     LM63_REG_LUT_TEMP(i));
233 		}
234 		data->lut_temp_hyst = i2c_smbus_read_byte_data(client,
235 				      LM63_REG_LUT_TEMP_HYST);
236 
237 		data->lut_last_updated = jiffies;
238 		data->lut_valid = 1;
239 	}
240 }
241 
242 static struct lm63_data *lm63_update_device(struct device *dev)
243 {
244 	struct i2c_client *client = to_i2c_client(dev);
245 	struct lm63_data *data = i2c_get_clientdata(client);
246 	unsigned long next_update;
247 
248 	mutex_lock(&data->update_lock);
249 
250 	next_update = data->last_updated
251 	  + msecs_to_jiffies(data->update_interval) + 1;
252 
253 	if (time_after(jiffies, next_update) || !data->valid) {
254 		if (data->config & 0x04) { /* tachometer enabled  */
255 			/* order matters for fan1_input */
256 			data->fan[0] = i2c_smbus_read_byte_data(client,
257 				       LM63_REG_TACH_COUNT_LSB) & 0xFC;
258 			data->fan[0] |= i2c_smbus_read_byte_data(client,
259 					LM63_REG_TACH_COUNT_MSB) << 8;
260 			data->fan[1] = (i2c_smbus_read_byte_data(client,
261 					LM63_REG_TACH_LIMIT_LSB) & 0xFC)
262 				     | (i2c_smbus_read_byte_data(client,
263 					LM63_REG_TACH_LIMIT_MSB) << 8);
264 		}
265 
266 		data->pwm1_freq = i2c_smbus_read_byte_data(client,
267 				  LM63_REG_PWM_FREQ);
268 		if (data->pwm1_freq == 0)
269 			data->pwm1_freq = 1;
270 		data->pwm1[0] = i2c_smbus_read_byte_data(client,
271 				LM63_REG_PWM_VALUE);
272 
273 		data->temp8[0] = i2c_smbus_read_byte_data(client,
274 				 LM63_REG_LOCAL_TEMP);
275 		data->temp8[1] = i2c_smbus_read_byte_data(client,
276 				 LM63_REG_LOCAL_HIGH);
277 
278 		/* order matters for temp2_input */
279 		data->temp11[0] = i2c_smbus_read_byte_data(client,
280 				  LM63_REG_REMOTE_TEMP_MSB) << 8;
281 		data->temp11[0] |= i2c_smbus_read_byte_data(client,
282 				   LM63_REG_REMOTE_TEMP_LSB);
283 		data->temp11[1] = (i2c_smbus_read_byte_data(client,
284 				  LM63_REG_REMOTE_LOW_MSB) << 8)
285 				| i2c_smbus_read_byte_data(client,
286 				  LM63_REG_REMOTE_LOW_LSB);
287 		data->temp11[2] = (i2c_smbus_read_byte_data(client,
288 				  LM63_REG_REMOTE_HIGH_MSB) << 8)
289 				| i2c_smbus_read_byte_data(client,
290 				  LM63_REG_REMOTE_HIGH_LSB);
291 		data->temp11[3] = (i2c_smbus_read_byte_data(client,
292 				  LM63_REG_REMOTE_OFFSET_MSB) << 8)
293 				| i2c_smbus_read_byte_data(client,
294 				  LM63_REG_REMOTE_OFFSET_LSB);
295 
296 		if (data->kind == lm96163)
297 			data->temp11u = (i2c_smbus_read_byte_data(client,
298 					LM96163_REG_REMOTE_TEMP_U_MSB) << 8)
299 				      | i2c_smbus_read_byte_data(client,
300 					LM96163_REG_REMOTE_TEMP_U_LSB);
301 
302 		data->temp8[2] = i2c_smbus_read_byte_data(client,
303 				 LM63_REG_REMOTE_TCRIT);
304 		data->temp2_crit_hyst = i2c_smbus_read_byte_data(client,
305 					LM63_REG_REMOTE_TCRIT_HYST);
306 
307 		data->alarms = i2c_smbus_read_byte_data(client,
308 			       LM63_REG_ALERT_STATUS) & 0x7F;
309 
310 		data->last_updated = jiffies;
311 		data->valid = 1;
312 	}
313 
314 	lm63_update_lut(client);
315 
316 	mutex_unlock(&data->update_lock);
317 
318 	return data;
319 }
320 
321 /*
322  * Trip points in the lookup table should be in ascending order for both
323  * temperatures and PWM output values.
324  */
325 static int lm63_lut_looks_bad(struct i2c_client *client)
326 {
327 	struct lm63_data *data = i2c_get_clientdata(client);
328 	int i;
329 
330 	mutex_lock(&data->update_lock);
331 	lm63_update_lut(client);
332 
333 	for (i = 1; i < data->lut_size; i++) {
334 		if (data->pwm1[1 + i - 1] > data->pwm1[1 + i]
335 		 || data->temp8[3 + i - 1] > data->temp8[3 + i]) {
336 			dev_warn(&client->dev,
337 				 "Lookup table doesn't look sane (check entries %d and %d)\n",
338 				 i, i + 1);
339 			break;
340 		}
341 	}
342 	mutex_unlock(&data->update_lock);
343 
344 	return i == data->lut_size ? 0 : 1;
345 }
346 
347 /*
348  * Sysfs callback functions and files
349  */
350 
351 static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
352 			char *buf)
353 {
354 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
355 	struct lm63_data *data = lm63_update_device(dev);
356 	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index]));
357 }
358 
359 static ssize_t set_fan(struct device *dev, struct device_attribute *dummy,
360 		       const char *buf, size_t count)
361 {
362 	struct i2c_client *client = to_i2c_client(dev);
363 	struct lm63_data *data = i2c_get_clientdata(client);
364 	unsigned long val;
365 	int err;
366 
367 	err = kstrtoul(buf, 10, &val);
368 	if (err)
369 		return err;
370 
371 	mutex_lock(&data->update_lock);
372 	data->fan[1] = FAN_TO_REG(val);
373 	i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_LSB,
374 				  data->fan[1] & 0xFF);
375 	i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_MSB,
376 				  data->fan[1] >> 8);
377 	mutex_unlock(&data->update_lock);
378 	return count;
379 }
380 
381 static ssize_t show_pwm1(struct device *dev, struct device_attribute *devattr,
382 			 char *buf)
383 {
384 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
385 	struct lm63_data *data = lm63_update_device(dev);
386 	int nr = attr->index;
387 	int pwm;
388 
389 	if (data->pwm_highres)
390 		pwm = data->pwm1[nr];
391 	else
392 		pwm = data->pwm1[nr] >= 2 * data->pwm1_freq ?
393 		       255 : (data->pwm1[nr] * 255 + data->pwm1_freq) /
394 		       (2 * data->pwm1_freq);
395 
396 	return sprintf(buf, "%d\n", pwm);
397 }
398 
399 static ssize_t set_pwm1(struct device *dev, struct device_attribute *devattr,
400 			const char *buf, size_t count)
401 {
402 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
403 	struct i2c_client *client = to_i2c_client(dev);
404 	struct lm63_data *data = i2c_get_clientdata(client);
405 	int nr = attr->index;
406 	unsigned long val;
407 	int err;
408 	u8 reg;
409 
410 	if (!(data->config_fan & 0x20)) /* register is read-only */
411 		return -EPERM;
412 
413 	err = kstrtoul(buf, 10, &val);
414 	if (err)
415 		return err;
416 
417 	reg = nr ? LM63_REG_LUT_PWM(nr - 1) : LM63_REG_PWM_VALUE;
418 	val = SENSORS_LIMIT(val, 0, 255);
419 
420 	mutex_lock(&data->update_lock);
421 	data->pwm1[nr] = data->pwm_highres ? val :
422 			(val * data->pwm1_freq * 2 + 127) / 255;
423 	i2c_smbus_write_byte_data(client, reg, data->pwm1[nr]);
424 	mutex_unlock(&data->update_lock);
425 	return count;
426 }
427 
428 static ssize_t show_pwm1_enable(struct device *dev,
429 				struct device_attribute *dummy, char *buf)
430 {
431 	struct lm63_data *data = lm63_update_device(dev);
432 	return sprintf(buf, "%d\n", data->config_fan & 0x20 ? 1 : 2);
433 }
434 
435 static ssize_t set_pwm1_enable(struct device *dev,
436 			       struct device_attribute *dummy,
437 			       const char *buf, size_t count)
438 {
439 	struct i2c_client *client = to_i2c_client(dev);
440 	struct lm63_data *data = i2c_get_clientdata(client);
441 	unsigned long val;
442 	int err;
443 
444 	err = kstrtoul(buf, 10, &val);
445 	if (err)
446 		return err;
447 	if (val < 1 || val > 2)
448 		return -EINVAL;
449 
450 	/*
451 	 * Only let the user switch to automatic mode if the lookup table
452 	 * looks sane.
453 	 */
454 	if (val == 2 && lm63_lut_looks_bad(client))
455 		return -EPERM;
456 
457 	mutex_lock(&data->update_lock);
458 	data->config_fan = i2c_smbus_read_byte_data(client,
459 						    LM63_REG_CONFIG_FAN);
460 	if (val == 1)
461 		data->config_fan |= 0x20;
462 	else
463 		data->config_fan &= ~0x20;
464 	i2c_smbus_write_byte_data(client, LM63_REG_CONFIG_FAN,
465 	data->config_fan);
466 	mutex_unlock(&data->update_lock);
467 	return count;
468 }
469 
470 /*
471  * There are 8bit registers for both local(temp1) and remote(temp2) sensor.
472  * For remote sensor registers temp2_offset has to be considered,
473  * for local sensor it must not.
474  * So we need separate 8bit accessors for local and remote sensor.
475  */
476 static ssize_t show_local_temp8(struct device *dev,
477 				struct device_attribute *devattr,
478 				char *buf)
479 {
480 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
481 	struct lm63_data *data = lm63_update_device(dev);
482 	return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[attr->index]));
483 }
484 
485 static ssize_t show_remote_temp8(struct device *dev,
486 				 struct device_attribute *devattr,
487 				 char *buf)
488 {
489 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
490 	struct lm63_data *data = lm63_update_device(dev);
491 	return sprintf(buf, "%d\n", temp8_from_reg(data, attr->index)
492 		       + data->temp2_offset);
493 }
494 
495 static ssize_t show_lut_temp(struct device *dev,
496 			      struct device_attribute *devattr,
497 			      char *buf)
498 {
499 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
500 	struct lm63_data *data = lm63_update_device(dev);
501 	return sprintf(buf, "%d\n", lut_temp_from_reg(data, attr->index)
502 		       + data->temp2_offset);
503 }
504 
505 static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
506 			 const char *buf, size_t count)
507 {
508 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
509 	struct i2c_client *client = to_i2c_client(dev);
510 	struct lm63_data *data = i2c_get_clientdata(client);
511 	int nr = attr->index;
512 	long val;
513 	int err;
514 	int temp;
515 	u8 reg;
516 
517 	err = kstrtol(buf, 10, &val);
518 	if (err)
519 		return err;
520 
521 	mutex_lock(&data->update_lock);
522 	switch (nr) {
523 	case 2:
524 		reg = LM63_REG_REMOTE_TCRIT;
525 		if (data->remote_unsigned)
526 			temp = TEMP8U_TO_REG(val - data->temp2_offset);
527 		else
528 			temp = TEMP8_TO_REG(val - data->temp2_offset);
529 		break;
530 	case 1:
531 		reg = LM63_REG_LOCAL_HIGH;
532 		temp = TEMP8_TO_REG(val);
533 		break;
534 	default:	/* lookup table */
535 		reg = LM63_REG_LUT_TEMP(nr - 3);
536 		temp = lut_temp_to_reg(data, val);
537 	}
538 	data->temp8[nr] = temp;
539 	i2c_smbus_write_byte_data(client, reg, temp);
540 	mutex_unlock(&data->update_lock);
541 	return count;
542 }
543 
544 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
545 			   char *buf)
546 {
547 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
548 	struct lm63_data *data = lm63_update_device(dev);
549 	int nr = attr->index;
550 	int temp;
551 
552 	if (!nr) {
553 		/*
554 		 * Use unsigned temperature unless its value is zero.
555 		 * If it is zero, use signed temperature.
556 		 */
557 		if (data->temp11u)
558 			temp = TEMP11_FROM_REG(data->temp11u);
559 		else
560 			temp = TEMP11_FROM_REG(data->temp11[nr]);
561 	} else {
562 		if (data->remote_unsigned && nr == 2)
563 			temp = TEMP11_FROM_REG((u16)data->temp11[nr]);
564 		else
565 			temp = TEMP11_FROM_REG(data->temp11[nr]);
566 	}
567 	return sprintf(buf, "%d\n", temp + data->temp2_offset);
568 }
569 
570 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
571 			  const char *buf, size_t count)
572 {
573 	static const u8 reg[6] = {
574 		LM63_REG_REMOTE_LOW_MSB,
575 		LM63_REG_REMOTE_LOW_LSB,
576 		LM63_REG_REMOTE_HIGH_MSB,
577 		LM63_REG_REMOTE_HIGH_LSB,
578 		LM63_REG_REMOTE_OFFSET_MSB,
579 		LM63_REG_REMOTE_OFFSET_LSB,
580 	};
581 
582 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
583 	struct i2c_client *client = to_i2c_client(dev);
584 	struct lm63_data *data = i2c_get_clientdata(client);
585 	long val;
586 	int err;
587 	int nr = attr->index;
588 
589 	err = kstrtol(buf, 10, &val);
590 	if (err)
591 		return err;
592 
593 	mutex_lock(&data->update_lock);
594 	if (data->remote_unsigned && nr == 2)
595 		data->temp11[nr] = TEMP11U_TO_REG(val - data->temp2_offset);
596 	else
597 		data->temp11[nr] = TEMP11_TO_REG(val - data->temp2_offset);
598 
599 	i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
600 				  data->temp11[nr] >> 8);
601 	i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
602 				  data->temp11[nr] & 0xff);
603 	mutex_unlock(&data->update_lock);
604 	return count;
605 }
606 
607 /*
608  * Hysteresis register holds a relative value, while we want to present
609  * an absolute to user-space
610  */
611 static ssize_t show_temp2_crit_hyst(struct device *dev,
612 				    struct device_attribute *dummy, char *buf)
613 {
614 	struct lm63_data *data = lm63_update_device(dev);
615 	return sprintf(buf, "%d\n", temp8_from_reg(data, 2)
616 		       + data->temp2_offset
617 		       - TEMP8_FROM_REG(data->temp2_crit_hyst));
618 }
619 
620 static ssize_t show_lut_temp_hyst(struct device *dev,
621 				  struct device_attribute *devattr, char *buf)
622 {
623 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
624 	struct lm63_data *data = lm63_update_device(dev);
625 
626 	return sprintf(buf, "%d\n", lut_temp_from_reg(data, attr->index)
627 		       + data->temp2_offset
628 		       - TEMP8_FROM_REG(data->lut_temp_hyst));
629 }
630 
631 /*
632  * And now the other way around, user-space provides an absolute
633  * hysteresis value and we have to store a relative one
634  */
635 static ssize_t set_temp2_crit_hyst(struct device *dev,
636 				   struct device_attribute *dummy,
637 				   const char *buf, size_t count)
638 {
639 	struct i2c_client *client = to_i2c_client(dev);
640 	struct lm63_data *data = i2c_get_clientdata(client);
641 	long val;
642 	int err;
643 	long hyst;
644 
645 	err = kstrtol(buf, 10, &val);
646 	if (err)
647 		return err;
648 
649 	mutex_lock(&data->update_lock);
650 	hyst = temp8_from_reg(data, 2) + data->temp2_offset - val;
651 	i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
652 				  HYST_TO_REG(hyst));
653 	mutex_unlock(&data->update_lock);
654 	return count;
655 }
656 
657 /*
658  * Set conversion rate.
659  * client->update_lock must be held when calling this function.
660  */
661 static void lm63_set_convrate(struct i2c_client *client, struct lm63_data *data,
662 			      unsigned int interval)
663 {
664 	int i;
665 	unsigned int update_interval;
666 
667 	/* Shift calculations to avoid rounding errors */
668 	interval <<= 6;
669 
670 	/* find the nearest update rate */
671 	update_interval = (1 << (LM63_MAX_CONVRATE + 6)) * 1000
672 	  / data->max_convrate_hz;
673 	for (i = 0; i < LM63_MAX_CONVRATE; i++, update_interval >>= 1)
674 		if (interval >= update_interval * 3 / 4)
675 			break;
676 
677 	i2c_smbus_write_byte_data(client, LM63_REG_CONVRATE, i);
678 	data->update_interval = UPDATE_INTERVAL(data->max_convrate_hz, i);
679 }
680 
681 static ssize_t show_update_interval(struct device *dev,
682 				    struct device_attribute *attr, char *buf)
683 {
684 	struct lm63_data *data = dev_get_drvdata(dev);
685 
686 	return sprintf(buf, "%u\n", data->update_interval);
687 }
688 
689 static ssize_t set_update_interval(struct device *dev,
690 				   struct device_attribute *attr,
691 				   const char *buf, size_t count)
692 {
693 	struct i2c_client *client = to_i2c_client(dev);
694 	struct lm63_data *data = i2c_get_clientdata(client);
695 	unsigned long val;
696 	int err;
697 
698 	err = kstrtoul(buf, 10, &val);
699 	if (err)
700 		return err;
701 
702 	mutex_lock(&data->update_lock);
703 	lm63_set_convrate(client, data, SENSORS_LIMIT(val, 0, 100000));
704 	mutex_unlock(&data->update_lock);
705 
706 	return count;
707 }
708 
709 static ssize_t show_type(struct device *dev, struct device_attribute *attr,
710 			 char *buf)
711 {
712 	struct i2c_client *client = to_i2c_client(dev);
713 	struct lm63_data *data = i2c_get_clientdata(client);
714 
715 	return sprintf(buf, data->trutherm ? "1\n" : "2\n");
716 }
717 
718 static ssize_t set_type(struct device *dev, struct device_attribute *attr,
719 			const char *buf, size_t count)
720 {
721 	struct i2c_client *client = to_i2c_client(dev);
722 	struct lm63_data *data = i2c_get_clientdata(client);
723 	unsigned long val;
724 	int ret;
725 	u8 reg;
726 
727 	ret = kstrtoul(buf, 10, &val);
728 	if (ret < 0)
729 		return ret;
730 	if (val != 1 && val != 2)
731 		return -EINVAL;
732 
733 	mutex_lock(&data->update_lock);
734 	data->trutherm = val == 1;
735 	reg = i2c_smbus_read_byte_data(client, LM96163_REG_TRUTHERM) & ~0x02;
736 	i2c_smbus_write_byte_data(client, LM96163_REG_TRUTHERM,
737 				  reg | (data->trutherm ? 0x02 : 0x00));
738 	data->valid = 0;
739 	mutex_unlock(&data->update_lock);
740 
741 	return count;
742 }
743 
744 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
745 			   char *buf)
746 {
747 	struct lm63_data *data = lm63_update_device(dev);
748 	return sprintf(buf, "%u\n", data->alarms);
749 }
750 
751 static ssize_t show_alarm(struct device *dev, struct device_attribute *devattr,
752 			  char *buf)
753 {
754 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
755 	struct lm63_data *data = lm63_update_device(dev);
756 	int bitnr = attr->index;
757 
758 	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
759 }
760 
761 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
762 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan,
763 	set_fan, 1);
764 
765 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1, 0);
766 static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
767 	show_pwm1_enable, set_pwm1_enable);
768 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IWUSR | S_IRUGO,
769 	show_pwm1, set_pwm1, 1);
770 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_temp, S_IWUSR | S_IRUGO,
771 	show_lut_temp, set_temp8, 3);
772 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_temp_hyst, S_IRUGO,
773 	show_lut_temp_hyst, NULL, 3);
774 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
775 	show_pwm1, set_pwm1, 2);
776 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_temp, S_IWUSR | S_IRUGO,
777 	show_lut_temp, set_temp8, 4);
778 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_temp_hyst, S_IRUGO,
779 	show_lut_temp_hyst, NULL, 4);
780 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IWUSR | S_IRUGO,
781 	show_pwm1, set_pwm1, 3);
782 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_temp, S_IWUSR | S_IRUGO,
783 	show_lut_temp, set_temp8, 5);
784 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_temp_hyst, S_IRUGO,
785 	show_lut_temp_hyst, NULL, 5);
786 static SENSOR_DEVICE_ATTR(pwm1_auto_point4_pwm, S_IWUSR | S_IRUGO,
787 	show_pwm1, set_pwm1, 4);
788 static SENSOR_DEVICE_ATTR(pwm1_auto_point4_temp, S_IWUSR | S_IRUGO,
789 	show_lut_temp, set_temp8, 6);
790 static SENSOR_DEVICE_ATTR(pwm1_auto_point4_temp_hyst, S_IRUGO,
791 	show_lut_temp_hyst, NULL, 6);
792 static SENSOR_DEVICE_ATTR(pwm1_auto_point5_pwm, S_IWUSR | S_IRUGO,
793 	show_pwm1, set_pwm1, 5);
794 static SENSOR_DEVICE_ATTR(pwm1_auto_point5_temp, S_IWUSR | S_IRUGO,
795 	show_lut_temp, set_temp8, 7);
796 static SENSOR_DEVICE_ATTR(pwm1_auto_point5_temp_hyst, S_IRUGO,
797 	show_lut_temp_hyst, NULL, 7);
798 static SENSOR_DEVICE_ATTR(pwm1_auto_point6_pwm, S_IWUSR | S_IRUGO,
799 	show_pwm1, set_pwm1, 6);
800 static SENSOR_DEVICE_ATTR(pwm1_auto_point6_temp, S_IWUSR | S_IRUGO,
801 	show_lut_temp, set_temp8, 8);
802 static SENSOR_DEVICE_ATTR(pwm1_auto_point6_temp_hyst, S_IRUGO,
803 	show_lut_temp_hyst, NULL, 8);
804 static SENSOR_DEVICE_ATTR(pwm1_auto_point7_pwm, S_IWUSR | S_IRUGO,
805 	show_pwm1, set_pwm1, 7);
806 static SENSOR_DEVICE_ATTR(pwm1_auto_point7_temp, S_IWUSR | S_IRUGO,
807 	show_lut_temp, set_temp8, 9);
808 static SENSOR_DEVICE_ATTR(pwm1_auto_point7_temp_hyst, S_IRUGO,
809 	show_lut_temp_hyst, NULL, 9);
810 static SENSOR_DEVICE_ATTR(pwm1_auto_point8_pwm, S_IWUSR | S_IRUGO,
811 	show_pwm1, set_pwm1, 8);
812 static SENSOR_DEVICE_ATTR(pwm1_auto_point8_temp, S_IWUSR | S_IRUGO,
813 	show_lut_temp, set_temp8, 10);
814 static SENSOR_DEVICE_ATTR(pwm1_auto_point8_temp_hyst, S_IRUGO,
815 	show_lut_temp_hyst, NULL, 10);
816 static SENSOR_DEVICE_ATTR(pwm1_auto_point9_pwm, S_IWUSR | S_IRUGO,
817 	show_pwm1, set_pwm1, 9);
818 static SENSOR_DEVICE_ATTR(pwm1_auto_point9_temp, S_IWUSR | S_IRUGO,
819 	show_lut_temp, set_temp8, 11);
820 static SENSOR_DEVICE_ATTR(pwm1_auto_point9_temp_hyst, S_IRUGO,
821 	show_lut_temp_hyst, NULL, 11);
822 static SENSOR_DEVICE_ATTR(pwm1_auto_point10_pwm, S_IWUSR | S_IRUGO,
823 	show_pwm1, set_pwm1, 10);
824 static SENSOR_DEVICE_ATTR(pwm1_auto_point10_temp, S_IWUSR | S_IRUGO,
825 	show_lut_temp, set_temp8, 12);
826 static SENSOR_DEVICE_ATTR(pwm1_auto_point10_temp_hyst, S_IRUGO,
827 	show_lut_temp_hyst, NULL, 12);
828 static SENSOR_DEVICE_ATTR(pwm1_auto_point11_pwm, S_IWUSR | S_IRUGO,
829 	show_pwm1, set_pwm1, 11);
830 static SENSOR_DEVICE_ATTR(pwm1_auto_point11_temp, S_IWUSR | S_IRUGO,
831 	show_lut_temp, set_temp8, 13);
832 static SENSOR_DEVICE_ATTR(pwm1_auto_point11_temp_hyst, S_IRUGO,
833 	show_lut_temp_hyst, NULL, 13);
834 static SENSOR_DEVICE_ATTR(pwm1_auto_point12_pwm, S_IWUSR | S_IRUGO,
835 	show_pwm1, set_pwm1, 12);
836 static SENSOR_DEVICE_ATTR(pwm1_auto_point12_temp, S_IWUSR | S_IRUGO,
837 	show_lut_temp, set_temp8, 14);
838 static SENSOR_DEVICE_ATTR(pwm1_auto_point12_temp_hyst, S_IRUGO,
839 	show_lut_temp_hyst, NULL, 14);
840 
841 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_local_temp8, NULL, 0);
842 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_local_temp8,
843 	set_temp8, 1);
844 
845 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
846 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
847 	set_temp11, 1);
848 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
849 	set_temp11, 2);
850 static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
851 	set_temp11, 3);
852 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_remote_temp8,
853 	set_temp8, 2);
854 static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
855 	set_temp2_crit_hyst);
856 
857 static DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type);
858 
859 /* Individual alarm files */
860 static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
861 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
862 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
863 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
864 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
865 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
866 /* Raw alarm file for compatibility */
867 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
868 
869 static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
870 		   set_update_interval);
871 
872 static struct attribute *lm63_attributes[] = {
873 	&sensor_dev_attr_pwm1.dev_attr.attr,
874 	&dev_attr_pwm1_enable.attr,
875 	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
876 	&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
877 	&sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr,
878 	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
879 	&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
880 	&sensor_dev_attr_pwm1_auto_point2_temp_hyst.dev_attr.attr,
881 	&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
882 	&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
883 	&sensor_dev_attr_pwm1_auto_point3_temp_hyst.dev_attr.attr,
884 	&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
885 	&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
886 	&sensor_dev_attr_pwm1_auto_point4_temp_hyst.dev_attr.attr,
887 	&sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
888 	&sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
889 	&sensor_dev_attr_pwm1_auto_point5_temp_hyst.dev_attr.attr,
890 	&sensor_dev_attr_pwm1_auto_point6_pwm.dev_attr.attr,
891 	&sensor_dev_attr_pwm1_auto_point6_temp.dev_attr.attr,
892 	&sensor_dev_attr_pwm1_auto_point6_temp_hyst.dev_attr.attr,
893 	&sensor_dev_attr_pwm1_auto_point7_pwm.dev_attr.attr,
894 	&sensor_dev_attr_pwm1_auto_point7_temp.dev_attr.attr,
895 	&sensor_dev_attr_pwm1_auto_point7_temp_hyst.dev_attr.attr,
896 	&sensor_dev_attr_pwm1_auto_point8_pwm.dev_attr.attr,
897 	&sensor_dev_attr_pwm1_auto_point8_temp.dev_attr.attr,
898 	&sensor_dev_attr_pwm1_auto_point8_temp_hyst.dev_attr.attr,
899 
900 	&sensor_dev_attr_temp1_input.dev_attr.attr,
901 	&sensor_dev_attr_temp2_input.dev_attr.attr,
902 	&sensor_dev_attr_temp2_min.dev_attr.attr,
903 	&sensor_dev_attr_temp1_max.dev_attr.attr,
904 	&sensor_dev_attr_temp2_max.dev_attr.attr,
905 	&sensor_dev_attr_temp2_offset.dev_attr.attr,
906 	&sensor_dev_attr_temp2_crit.dev_attr.attr,
907 	&dev_attr_temp2_crit_hyst.attr,
908 
909 	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
910 	&sensor_dev_attr_temp2_fault.dev_attr.attr,
911 	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
912 	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
913 	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
914 	&dev_attr_alarms.attr,
915 	&dev_attr_update_interval.attr,
916 	NULL
917 };
918 
919 static struct attribute *lm63_attributes_extra_lut[] = {
920 	&sensor_dev_attr_pwm1_auto_point9_pwm.dev_attr.attr,
921 	&sensor_dev_attr_pwm1_auto_point9_temp.dev_attr.attr,
922 	&sensor_dev_attr_pwm1_auto_point9_temp_hyst.dev_attr.attr,
923 	&sensor_dev_attr_pwm1_auto_point10_pwm.dev_attr.attr,
924 	&sensor_dev_attr_pwm1_auto_point10_temp.dev_attr.attr,
925 	&sensor_dev_attr_pwm1_auto_point10_temp_hyst.dev_attr.attr,
926 	&sensor_dev_attr_pwm1_auto_point11_pwm.dev_attr.attr,
927 	&sensor_dev_attr_pwm1_auto_point11_temp.dev_attr.attr,
928 	&sensor_dev_attr_pwm1_auto_point11_temp_hyst.dev_attr.attr,
929 	&sensor_dev_attr_pwm1_auto_point12_pwm.dev_attr.attr,
930 	&sensor_dev_attr_pwm1_auto_point12_temp.dev_attr.attr,
931 	&sensor_dev_attr_pwm1_auto_point12_temp_hyst.dev_attr.attr,
932 	NULL
933 };
934 
935 static const struct attribute_group lm63_group_extra_lut = {
936 	.attrs = lm63_attributes_extra_lut,
937 };
938 
939 /*
940  * On LM63, temp2_crit can be set only once, which should be job
941  * of the bootloader.
942  * On LM64, temp2_crit can always be set.
943  * On LM96163, temp2_crit can be set if bit 1 of the configuration
944  * register is true.
945  */
946 static umode_t lm63_attribute_mode(struct kobject *kobj,
947 				   struct attribute *attr, int index)
948 {
949 	struct device *dev = container_of(kobj, struct device, kobj);
950 	struct i2c_client *client = to_i2c_client(dev);
951 	struct lm63_data *data = i2c_get_clientdata(client);
952 
953 	if (attr == &sensor_dev_attr_temp2_crit.dev_attr.attr
954 	    && (data->kind == lm64 ||
955 		(data->kind == lm96163 && (data->config & 0x02))))
956 		return attr->mode | S_IWUSR;
957 
958 	return attr->mode;
959 }
960 
961 static const struct attribute_group lm63_group = {
962 	.is_visible = lm63_attribute_mode,
963 	.attrs = lm63_attributes,
964 };
965 
966 static struct attribute *lm63_attributes_fan1[] = {
967 	&sensor_dev_attr_fan1_input.dev_attr.attr,
968 	&sensor_dev_attr_fan1_min.dev_attr.attr,
969 
970 	&sensor_dev_attr_fan1_min_alarm.dev_attr.attr,
971 	NULL
972 };
973 
974 static const struct attribute_group lm63_group_fan1 = {
975 	.attrs = lm63_attributes_fan1,
976 };
977 
978 /*
979  * Real code
980  */
981 
982 /* Return 0 if detection is successful, -ENODEV otherwise */
983 static int lm63_detect(struct i2c_client *client,
984 		       struct i2c_board_info *info)
985 {
986 	struct i2c_adapter *adapter = client->adapter;
987 	u8 man_id, chip_id, reg_config1, reg_config2;
988 	u8 reg_alert_status, reg_alert_mask;
989 	int address = client->addr;
990 
991 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
992 		return -ENODEV;
993 
994 	man_id = i2c_smbus_read_byte_data(client, LM63_REG_MAN_ID);
995 	chip_id = i2c_smbus_read_byte_data(client, LM63_REG_CHIP_ID);
996 
997 	reg_config1 = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1);
998 	reg_config2 = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG2);
999 	reg_alert_status = i2c_smbus_read_byte_data(client,
1000 			   LM63_REG_ALERT_STATUS);
1001 	reg_alert_mask = i2c_smbus_read_byte_data(client, LM63_REG_ALERT_MASK);
1002 
1003 	if (man_id != 0x01 /* National Semiconductor */
1004 	 || (reg_config1 & 0x18) != 0x00
1005 	 || (reg_config2 & 0xF8) != 0x00
1006 	 || (reg_alert_status & 0x20) != 0x00
1007 	 || (reg_alert_mask & 0xA4) != 0xA4) {
1008 		dev_dbg(&adapter->dev,
1009 			"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
1010 			man_id, chip_id);
1011 		return -ENODEV;
1012 	}
1013 
1014 	if (chip_id == 0x41 && address == 0x4c)
1015 		strlcpy(info->type, "lm63", I2C_NAME_SIZE);
1016 	else if (chip_id == 0x51 && (address == 0x18 || address == 0x4e))
1017 		strlcpy(info->type, "lm64", I2C_NAME_SIZE);
1018 	else if (chip_id == 0x49 && address == 0x4c)
1019 		strlcpy(info->type, "lm96163", I2C_NAME_SIZE);
1020 	else
1021 		return -ENODEV;
1022 
1023 	return 0;
1024 }
1025 
1026 /*
1027  * Ideally we shouldn't have to initialize anything, since the BIOS
1028  * should have taken care of everything
1029  */
1030 static void lm63_init_client(struct i2c_client *client)
1031 {
1032 	struct lm63_data *data = i2c_get_clientdata(client);
1033 	u8 convrate;
1034 
1035 	data->config = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1);
1036 	data->config_fan = i2c_smbus_read_byte_data(client,
1037 						    LM63_REG_CONFIG_FAN);
1038 
1039 	/* Start converting if needed */
1040 	if (data->config & 0x40) { /* standby */
1041 		dev_dbg(&client->dev, "Switching to operational mode\n");
1042 		data->config &= 0xA7;
1043 		i2c_smbus_write_byte_data(client, LM63_REG_CONFIG1,
1044 					  data->config);
1045 	}
1046 	/* Tachometer is always enabled on LM64 */
1047 	if (data->kind == lm64)
1048 		data->config |= 0x04;
1049 
1050 	/* We may need pwm1_freq before ever updating the client data */
1051 	data->pwm1_freq = i2c_smbus_read_byte_data(client, LM63_REG_PWM_FREQ);
1052 	if (data->pwm1_freq == 0)
1053 		data->pwm1_freq = 1;
1054 
1055 	switch (data->kind) {
1056 	case lm63:
1057 	case lm64:
1058 		data->max_convrate_hz = LM63_MAX_CONVRATE_HZ;
1059 		data->lut_size = 8;
1060 		break;
1061 	case lm96163:
1062 		data->max_convrate_hz = LM96163_MAX_CONVRATE_HZ;
1063 		data->lut_size = 12;
1064 		data->trutherm
1065 		  = i2c_smbus_read_byte_data(client,
1066 					     LM96163_REG_TRUTHERM) & 0x02;
1067 		break;
1068 	}
1069 	convrate = i2c_smbus_read_byte_data(client, LM63_REG_CONVRATE);
1070 	if (unlikely(convrate > LM63_MAX_CONVRATE))
1071 		convrate = LM63_MAX_CONVRATE;
1072 	data->update_interval = UPDATE_INTERVAL(data->max_convrate_hz,
1073 						convrate);
1074 
1075 	/*
1076 	 * For LM96163, check if high resolution PWM
1077 	 * and unsigned temperature format is enabled.
1078 	 */
1079 	if (data->kind == lm96163) {
1080 		u8 config_enhanced
1081 		  = i2c_smbus_read_byte_data(client,
1082 					     LM96163_REG_CONFIG_ENHANCED);
1083 		if (config_enhanced & 0x20)
1084 			data->lut_temp_highres = true;
1085 		if ((config_enhanced & 0x10)
1086 		    && !(data->config_fan & 0x08) && data->pwm1_freq == 8)
1087 			data->pwm_highres = true;
1088 		if (config_enhanced & 0x08)
1089 			data->remote_unsigned = true;
1090 	}
1091 
1092 	/* Show some debug info about the LM63 configuration */
1093 	if (data->kind == lm63)
1094 		dev_dbg(&client->dev, "Alert/tach pin configured for %s\n",
1095 			(data->config & 0x04) ? "tachometer input" :
1096 			"alert output");
1097 	dev_dbg(&client->dev, "PWM clock %s kHz, output frequency %u Hz\n",
1098 		(data->config_fan & 0x08) ? "1.4" : "360",
1099 		((data->config_fan & 0x08) ? 700 : 180000) / data->pwm1_freq);
1100 	dev_dbg(&client->dev, "PWM output active %s, %s mode\n",
1101 		(data->config_fan & 0x10) ? "low" : "high",
1102 		(data->config_fan & 0x20) ? "manual" : "auto");
1103 }
1104 
1105 static int lm63_probe(struct i2c_client *client,
1106 		      const struct i2c_device_id *id)
1107 {
1108 	struct lm63_data *data;
1109 	int err;
1110 
1111 	data = kzalloc(sizeof(struct lm63_data), GFP_KERNEL);
1112 	if (!data) {
1113 		err = -ENOMEM;
1114 		goto exit;
1115 	}
1116 
1117 	i2c_set_clientdata(client, data);
1118 	data->valid = 0;
1119 	mutex_init(&data->update_lock);
1120 
1121 	/* Set the device type */
1122 	data->kind = id->driver_data;
1123 	if (data->kind == lm64)
1124 		data->temp2_offset = 16000;
1125 
1126 	/* Initialize chip */
1127 	lm63_init_client(client);
1128 
1129 	/* Register sysfs hooks */
1130 	err = sysfs_create_group(&client->dev.kobj, &lm63_group);
1131 	if (err)
1132 		goto exit_free;
1133 	if (data->config & 0x04) { /* tachometer enabled */
1134 		err = sysfs_create_group(&client->dev.kobj, &lm63_group_fan1);
1135 		if (err)
1136 			goto exit_remove_files;
1137 	}
1138 	if (data->kind == lm96163) {
1139 		err = device_create_file(&client->dev, &dev_attr_temp2_type);
1140 		if (err)
1141 			goto exit_remove_files;
1142 
1143 		err = sysfs_create_group(&client->dev.kobj,
1144 					 &lm63_group_extra_lut);
1145 		if (err)
1146 			goto exit_remove_files;
1147 	}
1148 
1149 	data->hwmon_dev = hwmon_device_register(&client->dev);
1150 	if (IS_ERR(data->hwmon_dev)) {
1151 		err = PTR_ERR(data->hwmon_dev);
1152 		goto exit_remove_files;
1153 	}
1154 
1155 	return 0;
1156 
1157 exit_remove_files:
1158 	sysfs_remove_group(&client->dev.kobj, &lm63_group);
1159 	sysfs_remove_group(&client->dev.kobj, &lm63_group_fan1);
1160 	if (data->kind == lm96163) {
1161 		device_remove_file(&client->dev, &dev_attr_temp2_type);
1162 		sysfs_remove_group(&client->dev.kobj, &lm63_group_extra_lut);
1163 	}
1164 exit_free:
1165 	kfree(data);
1166 exit:
1167 	return err;
1168 }
1169 
1170 static int lm63_remove(struct i2c_client *client)
1171 {
1172 	struct lm63_data *data = i2c_get_clientdata(client);
1173 
1174 	hwmon_device_unregister(data->hwmon_dev);
1175 	sysfs_remove_group(&client->dev.kobj, &lm63_group);
1176 	sysfs_remove_group(&client->dev.kobj, &lm63_group_fan1);
1177 	if (data->kind == lm96163) {
1178 		device_remove_file(&client->dev, &dev_attr_temp2_type);
1179 		sysfs_remove_group(&client->dev.kobj, &lm63_group_extra_lut);
1180 	}
1181 
1182 	kfree(data);
1183 	return 0;
1184 }
1185 
1186 /*
1187  * Driver data (common to all clients)
1188  */
1189 
1190 static const struct i2c_device_id lm63_id[] = {
1191 	{ "lm63", lm63 },
1192 	{ "lm64", lm64 },
1193 	{ "lm96163", lm96163 },
1194 	{ }
1195 };
1196 MODULE_DEVICE_TABLE(i2c, lm63_id);
1197 
1198 static struct i2c_driver lm63_driver = {
1199 	.class		= I2C_CLASS_HWMON,
1200 	.driver = {
1201 		.name	= "lm63",
1202 	},
1203 	.probe		= lm63_probe,
1204 	.remove		= lm63_remove,
1205 	.id_table	= lm63_id,
1206 	.detect		= lm63_detect,
1207 	.address_list	= normal_i2c,
1208 };
1209 
1210 module_i2c_driver(lm63_driver);
1211 
1212 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
1213 MODULE_DESCRIPTION("LM63 driver");
1214 MODULE_LICENSE("GPL");
1215